org.apache.hadoop.hive.ql.exec.vector.ptf.VectorPTFEvaluatorLongLastValue Maven / Gradle / Ivy
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* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
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package org.apache.hadoop.hive.ql.exec.vector.ptf;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hive.ql.exec.vector.LongColumnVector;
import org.apache.hadoop.hive.ql.exec.vector.VectorizedRowBatch;
import org.apache.hadoop.hive.ql.exec.vector.ColumnVector.Type;
import org.apache.hadoop.hive.ql.exec.vector.expressions.VectorExpression;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.ql.plan.ptf.WindowFrameDef;
import hive.com.google.common.base.Preconditions;
/**
* This class evaluates long first_value() for a PTF group.
*
* We capture the last value from the last batch. It can be NULL.
* It becomes the group value.
*/
public class VectorPTFEvaluatorLongLastValue extends VectorPTFEvaluatorBase {
private static final long serialVersionUID = 1L;
private static final String CLASS_NAME = VectorPTFEvaluatorLongLastValue.class.getName();
private static final Log LOG = LogFactory.getLog(CLASS_NAME);
protected boolean isGroupResultNull;
protected long lastValue;
public VectorPTFEvaluatorLongLastValue(WindowFrameDef windowFrameDef,
VectorExpression inputVecExpr, int outputColumnNum) {
super(windowFrameDef, inputVecExpr, outputColumnNum);
resetEvaluator();
}
public void evaluateGroupBatch(VectorizedRowBatch batch, boolean isLastGroupBatch)
throws HiveException {
evaluateInputExpr(batch);
// Last row of last batch determines isGroupResultNull and long lastValue.
// We do not filter when PTF is in reducer.
Preconditions.checkState(!batch.selectedInUse);
if (!isLastGroupBatch) {
return;
}
final int size = batch.size;
if (size == 0) {
return;
}
LongColumnVector longColVector = ((LongColumnVector) batch.cols[inputColumnNum]);
if (longColVector.isRepeating) {
if (longColVector.noNulls || !longColVector.isNull[0]) {
lastValue = longColVector.vector[0];
isGroupResultNull = false;
} else {
isGroupResultNull = true;
}
} else if (longColVector.noNulls) {
lastValue = longColVector.vector[size - 1];
isGroupResultNull = false;
} else {
final int lastBatchIndex = size - 1;
if (!longColVector.isNull[lastBatchIndex]) {
lastValue = longColVector.vector[lastBatchIndex];
isGroupResultNull = false;
} else {
isGroupResultNull = true;
}
}
}
@Override
public boolean isGroupResultNull() {
return isGroupResultNull;
}
@Override
public Type getResultColumnVectorType() {
return Type.LONG;
}
@Override
public long getLongGroupResult() {
return lastValue;
}
@Override
public void resetEvaluator() {
isGroupResultNull = true;
lastValue = 0;
}
}